The Case of the Racing Heart

Why does your heart beat faster when you run? Follow Watson and Sherlock into a body-science mystery.

Published story

Continue the conversation with the Notice → Wonder → Ask activity.

Published book · sold separately. See the retailer for current price and availability.

Let the story start a conversation.

After reading, invite your child to choose one thing they noticed about the body and one question they would like to explore.

You can talk, point, draw, or write. There is no right answer to find today.

This shared activity works with either book. No purchase is needed.

Published book · public links checked Nov 3, 2026